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<td><a href="VMSpecTOC.doc.html">Contents</a> | <a href="VMSpecIX.fm19.html">Prev</a> | <a href="VMSpecIX.fm21.html">Next</a> | <a href="VMSpecIX.fm.html">Index</a></td><td align=right><i><i>The Java<sup><font size=-2>TM</font></sup> Virtual Machine Specification</i></i></td>
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<a name="6961650"></a>
<center><h1> U</h1></center>
<dl><dt><b>u1
</b><dl>
<a name="6961653"></a>
<dt>as class<a href="ClassFile.doc.html#6289"> file data type,&#32;93</a>
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<dt><b>u2
</b><dl>
<a name="6961656"></a>
<dt>as class<a href="ClassFile.doc.html#6289"> file data type,&#32;93</a>
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<dt><b>u4
</b><dl>
<a name="6961659"></a>
<dt>as class<a href="ClassFile.doc.html#6289"> file data type,&#32;93</a>
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<dt><b><strong>underflow
</strong></b><dl>
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<dt><a href="Overview.doc.html#14562">floating-point, Java virtual machine handling,&#32;85</a>
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<dt><a href="Overview.doc.html#31340">integer data types, not signaled by Java  virtual machine,&#32;85</a>
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<dt><b><strong>Unicode
</strong></b><dl>
<a name="6961667"></a>
<dt><a href="Concepts.doc.html#25310">bibliographic reference,&#32;5</a>
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<dt><a href="Concepts.doc.html#25310">characteristics,&#32;5</a>
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<dt><b>UnknownError
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<dt><a href="Concepts.doc.html#25189">as Java virtual machine error,&#32;46</a>
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<dt><b><strong>unloading
</strong></b><dl>
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<dt><a href="Concepts.doc.html#32203">class or interface,&#32;57</a>
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<dt><b>UnsatisfiedLinkError
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<dt><em>See also</em> binding; LinkageError;  native method
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<dt><a href="Concepts.doc.html#28429">definition,&#32;45</a>
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<dt>thrown by
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<dt>invokeinterface<a href="Instructions2.doc6.html#invokeinterface">,&#32;282</a>
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<dt>invokespecial<a href="Instructions2.doc6.html#invokespecial">,&#32;287</a>
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<dt>invokestatic<a href="Instructions2.doc6.html#invokestatic">,&#32;290</a>
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<dt>invokevirtual<a href="Instructions2.doc11.html#putfield">,&#32;293</a>
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<dt><b>UnsupportedClassVersionError
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<dt><a href="Concepts.doc.html#32605">definition,&#32;49</a>
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<dt><b><strong>UTF-8 format
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<dt><em>See also</em> CONSTANT_Utf8_info structure
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<dt><a href="ClassFile.doc.html#6111">bibliographic reference,&#32;111</a>
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<dt><a href="ClassFile.doc.html#6111">standard, differences between Java virtual machine UTF-8 strings and,&#32;111</a>
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<font size="-1"><i>The Java</i><sup><font size=-2>TM</font></sup><i> Virtual Machine Specification </i><br>
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